Improved steam-boiler



NITED STATES PATENT OEEICE.l

iM'PRovEo s/TEAMBoiLER.

Specilication forming part of Letters Patent No. 36,278, dated August A26, 1862.

To aZZ whom may concern.-

Be it known that I, GEORGE H. CoELIss, of Providence, inthe State of Rhode Island, have 'invented a new and useful Improvement in Steam-Boilers; and I do hereby declare that.

the following is a full and exact description thereof, reference being had to the accompanying drawings, in Which- Figure 1 represents a vertical section of my improved boiler; Fig. 2, a horizontal section or ground plan of the same. v

At A is represented a circulating-reservoir for steam and water.

At B B are represented cylindrical generators containing vertical tubes, within which the products of combustion are received from the furnace and passed into the chimney H.

At c c are shown connections for supplying water from the reservoir to the generators.

At d d are shown connections through which the heated waterl passes back into the reser-V voir.

At e e are shown passages for steam from the generators to the upper portion of the resi culating-reservoir and the tubular generators pass.

By the construction of boilers in the manner now proposed the following important objects are combined: A rapid circulation'of the water through the generators, whereby the heating-surfaces of the tubes are rendered highlyv eii'ective. A boiler of this form can be conveniently handled and transported in sections.

` It combines great strength in proportion to the weight of materials used in its construction.

When the water in the boilers contains substances which are liable to be deposited, such s deposition takes place in the circulating-reservoir A, in consequence of the much greater quiescence of the water in that reservoir than in the generators. These deposits fall upon a part of the apparatus which is not subject to the direct action of the tire, and they are made increased or diminished without a departure from the principle of my invention.

When asingle generator is desired, I sometimes place this concentrically within the circulating-reservoir, instead ot' arranging it as above described. In such cases I makethe generator of smaller diameter than the reservoir and freely communicating with it both at the bottom and the top. The upward current which is caused by the products of combustion in ascending through the tubes descends along (the intervening space between the generator t `and the surrounding reservoir, and, entering to theV generator again at the bottom, keeps up a constant and rapid circulation upon the same principle as that already described.

Experience in the use of this form of boilers .has shown that the spaces occupied by the steam and Water` in the generators should be atleast four times that of the tubes.

What I claim as my invention, and desire to secure by Letters Patent, is-.

The method of constructing steam-boilers by combining cylindrical circulating-reservoirs with cylindrical tubular generators, ar-

ranged and connected substantially as and for the purposes specified.

y GEO. H. CORLISS. Witnesses: f

EDWIN S. JACOB,

GUsTAvUs DIETERICH. 

